<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Crypt
 * @subpackage Rsa
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Private.php 16971 2009-07-22 18:05:45Z mikaelkael $
 */

/**
 * @see Zend_Crypt_Rsa_Key
 */
require_once 'Zend/Crypt/Rsa/Key.php';

/**
 * @category   Zend
 * @package    Zend_Crypt
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Crypt_Rsa_Key_Private extends Zend_Crypt_Rsa_Key
{

	protected $_publicKey = null;

	public function __construct($pemString, $passPhrase = null)
	{
		$this->_pemString = $pemString;
		$this->_parse($passPhrase);
	}

	/**
	 * @param string $passPhrase
	 * @throws Zend_Crypt_Exception
	 */
	protected function _parse($passPhrase)
	{
		$result = openssl_get_privatekey($this->_pemString, $passPhrase);
		if (!$result) {
			/**
			 * @see Zend_Crypt_Exception
			 */
			require_once 'Zend/Crypt/Exception.php';
			throw new Zend_Crypt_Exception('Unable to load private key');
		}
		$this->_opensslKeyResource = $result;
		$this->_details = openssl_pkey_get_details($this->_opensslKeyResource);
	}

	public function getPublicKey()
	{
		if (is_null($this->_publicKey)) {
			/**
			 * @see Zend_Crypt_Rsa_Key_Public
			 */
			require_once 'Zend/Crypt/Rsa/Key/Public.php';
			$this->_publicKey = new Zend_Crypt_Rsa_Key_Public($this->_details['key']);
		}
		return $this->_publicKey;
	}

}